JPH03500333A - filling level indicator - Google Patents
filling level indicatorInfo
- Publication number
- JPH03500333A JPH03500333A JP1505392A JP50539289A JPH03500333A JP H03500333 A JPH03500333 A JP H03500333A JP 1505392 A JP1505392 A JP 1505392A JP 50539289 A JP50539289 A JP 50539289A JP H03500333 A JPH03500333 A JP H03500333A
- Authority
- JP
- Japan
- Prior art keywords
- filling level
- transmitter
- level indicator
- temperature
- coefficient
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるため要約のデータは記録されません。 (57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】 充填レベル表示装置 技術分野 本発明は、特許請求の範囲第１項に記載の形式の充填レベル表示装置に関する。[Detailed description of the invention] filling level indicator Technical field The invention relates to a filling level indicating device of the type claimed in claim 1.
背景技術 伝音性の固体中に音を導入し、そして受信機を用いてたわみ波の伝は速度（移送 速度）の変化を測定することは公知である。固体内におけるたわみ波の伝は速度 は、液面の高さに関係して影響を受ける。そこでは、液体容器が空の場合の固体 中の伝は速度が基準値として使用される。このなめに追加的な測定値が必要であ る。さらに１発信機及び受信機が液体と接触してはならない、もし接触すると、 発信機ないし受信機の不十分な液密せ又は接着部の不十分な耐久フッのために欠 陥が生じる。また充填レベル表示装置のゼロ点及び測定感度は温度に左右される 。Background technology Introduce sound into a conductive solid and use a receiver to determine the velocity (transport) of the flexural waves. It is known to measure changes in speed). The propagation of flexural waves in a solid is the velocity is affected by the height of the liquid level. There, the solid when the liquid container is empty In Nakaden, speed is used as a reference value. Additional measurements are required for this lick. Ru. Additionally, the transmitter and receiver must not come into contact with liquids; if they do, Inadequate sealing of the transmitter or receiver or insufficient durability of the adhesive. A failure occurs. Also, the zero point and measurement sensitivity of the filling level display device are affected by temperature. .
発明の開示 それに対して、特許請求の範囲第１項の特徴事項を備える本発明の充填レベル表 示装置は、非常に正確に測定を行うという利点を有する。充填レベル表示装置の ゼロ点及び測定５度への温度影響は十分に排除され得る。基準行程及び評価ユニ ットにおける面倒な計算による修正はもはや必要な゛い、そのために従来必要で あった。伝達体における追加的な温度測定を省略することができる。Disclosure of invention In contrast, the filling level table of the present invention having the features of claim 1 The display device has the advantage of making measurements very accurately. filling level indicator Temperature effects on the zero point and the measuring 5 degrees can be largely eliminated. Standard process and evaluation unit Troublesome calculations are no longer needed to correct the there were. Additional temperature measurements at the transmission body can be omitted.
従属請求項に記載の措置によって、請求項１記叙の装置の有利な改良が可能であ る。Advantageous improvements to the device recited in claim 1 are possible by the measures recited in the dependent claims. Ru.
図面の簡単な説明 本発明のり施例は、図面に示されると共に以下の記載においてより詳細に説明さ れる。Brief description of the drawing Glue embodiments of the invention are illustrated in the drawings and explained in more detail in the following description. It will be done.
第１図は、充填レベル表示装置の断面図、第２図は、測定１１図を示す。FIG. 1 shows a sectional view of the filling level indicator, and FIG. 2 shows a measurement diagram.
発明を実施するための最良の形態 第１図において自動車の燃料用のタンクが符号１゜により示されており、燃料量 のための充填レベル表示装置ｉ１２の伝音体１１が同タンク内に侵入している。BEST MODE FOR CARRYING OUT THE INVENTION In Figure 1, the fuel tank of a car is indicated by the symbol 1°, and the amount of fuel The sound conductor 11 of the filling level display device i12 has entered the tank.
伝音体１１は、燃料から突出しているその上端部において発信機１３及び受信機 １４を有する０発信機１３は、特に超音波の発振器として構成されている９発信 機１３も受信機１４もタンク１０の最大充填高さしの上に配置されており、その 結果両者が燃料内に浸されることはない、タンク１０における燃料の有効な充填 高さは符号りで示されている０発信機１３及び受信機１４は、詳細には示されて いない評価装置１５に接続されている。The sound conductor 11 has a transmitter 13 and a receiver at its upper end protruding from the fuel. The 0 transmitter 13 with 14 has a 9 transmitter 13 which is especially configured as an ultrasonic oscillator. Both the machine 13 and the receiver 14 are located above the maximum filling height of the tank 10; The result is an effective filling of fuel in the tank 10 without both being immersed in fuel. The height is indicated by the symbol 0. The transmitter 13 and the receiver 14 are not shown in detail. It is connected to the evaluation device 15 which is not installed.
発信１１！１３によって、伝音体１１内に音波１７（いわゆるたわみ波、即ち伝 ば速度が周波数に依存するところの横波）が励起される。たわみ波の場合、微小 振動部分が板平面及び伝は方向に対して本質的に垂直に振動するところの、板体 又は棒体における物体音波が問題になる。さらに、燃料の充填高さｈの近傍の物 体音波の伝は速度は、伝音体１１の燃料上の空気によって包囲された領域Ｌ−ｈ 内の伝は速度よりも本質的に低い、第１図に示すように、音波１７は移行面１８ においてその周囲の媒体と接触する。音波１７の伝は速度への影響は、移行面１ ８の大きさにしたがって決定されるとともに、伝音体１１の幾何学的形状に依存 する。充填高さｈに依存して、たわみ波の伝は速度（移送速度）が多かれ少なか れ変化する。このような測定効果は、背景技術に記載した充填レベル表示装置に おいても利用されている。Due to the transmission 11!13, a sound wave 17 (so-called flexural wave, i.e., a transmission wave) is generated in the sound conductor 11. transverse waves whose velocity depends on frequency) are excited. In the case of deflection waves, minute A plate where the vibrating part vibrates essentially perpendicular to the plane of the plate and the direction of transmission. Alternatively, object sound waves in the rod become a problem. Furthermore, objects near the fuel filling height h The speed of transmission of the body sound wave is the area L-h surrounded by the air above the fuel of the sound conductor 11. The propagation within the plane is essentially lower than the velocity, as shown in FIG. in contact with its surrounding medium. The influence of the propagation of sound waves 17 on the velocity is the transition surface 1 8 and also depends on the geometrical shape of the sound conductor 11. do. Depending on the filling height h, the flexural waves propagate at a higher or lower speed (transfer velocity). changes. Such a measurement effect is achieved by the filling level display device described in the background technology. It is also used in many cases.
充填レベル表示装置１２のゼロ点についての温度に関係する誤差原因としては、 伝音体１１の弾性係数Ｅの温度依存性、長さし、厚さＤそして使用された材料の 密度ρが考えられる。伝音体の材料特性について、ＴＫＥ＝−ＴＫＬ が成り立つ場合に、ゼロ点の温度依存性が補償されることが特に有利であると判 明した。こ、：にＴＫＥは弾性係数Ｅの温度係数であり、ＴＫＬは伝音体１１の 線膨張係数りの温度係数である。前記条件は、例えば材Ｆｌ テルメ５ ス） （Ｒ）４００２ （Ｖａｃｕｕｍｓｃｈｍｅｌｚｅ、Ｈａｎａｕ） ニよって正 確に満たされる。Ｅ係数及びｖＬａｇＬａ上の温度係数は、以下の表において種 々の材料について表示されている。Temperature-related error causes for the zero point of the filling level display device 12 include: Temperature dependence of elastic modulus E of sound conductor 11, length, thickness D, and material used The density ρ can be considered. Regarding the material properties of the sound conductor, TKE=-TKL It turns out to be particularly advantageous to compensate for the temperature dependence of the zero point when I made it clear. Here, TKE is the temperature coefficient of the elastic coefficient E, and TKL is the temperature coefficient of the sound conductor 11. It is the temperature coefficient of linear expansion coefficient. The above conditions include, for example, the material Fl Termes 5) (R) 4002 (Vacuumschmelze, Hanau) definitely fulfilled. The E coefficient and the temperature coefficient on vLagLa are shown in the table below. Each material is displayed.
材料 Ｔ Ｋ Ｅ ［１／に］ ＴＫＬ［＋／に］銅 −３，２１０１，７１０ −５ アルミニウム −３，１１０２，４１０−５スチール（合金でない）−２，０１ ０＝ Ｌｌｌｏ−５（Ｒ） −６ テルメラスト ４００２ −５．０１０ ８．５１０−６さらに１周囲の媒体に よる伝音体１１中のたわみ波の伝は速度への影響は、同媒体の物理的特性値、即 ち密度及び体積弾性率に依存している。これによりたわみ波の伝は速度は液体中 の音速度にも依存する０以上の値は全て温度に関係しており、したがってたわみ 波の速度への影響も温度に関係している０本発明によれば、測定誤差は、発信機 １３により供給された音波の測定周波数に大きく左在されることが判明した。こ の温度影響は、液体によって包囲された伝音体中のたわみ波の速度が液体中の密 度波の速度と等しくなる際の限界周波数に測定周波数が近付けば近付くほど、大 きくなる。Material T K E [1/] TKL [+/] Copper -3,2101,710 -5 Aluminum -3,1102,410-5 Steel (not alloyed) -2,01 0=Lllo-5(R)-6 Termerast 4002-5.010 8.510-6 and 1 surrounding medium The influence of the propagation of flexural waves in the sound conductor 11 on the velocity depends on the physical characteristics of the medium, immediately It depends on density and bulk modulus. As a result, the propagation speed of the flexural wave in the liquid is All values greater than 0 that also depend on the speed of sound are related to temperature, and therefore the deflection The influence on wave speed is also related to temperature.According to the invention, measurement errors are caused by It was found that the measured frequency of the sound waves supplied by 13 was significantly affected. child The temperature effect of The closer the measured frequency is to the limit frequency at which it becomes equal to the speed of the wave, the greater the I hear it.
自動車のタンクにこの充填レベル表示装置が使用される場合、一般的には一２０ ℃〜６０℃の稼働範囲が存在する。この稼働範囲について、２０℃に想定された 平均稼Ｓ温度において与えられた測定感度に対して平均誤差が最小になるような 、発信機１３の信号周波数ｆを定めることができる。１！！ｌ定Ｓ度の概念は、 液体の負荷によるたわみ波の速度変化であると理解することができる０発信機１ ３の周波数ｆが液体のデータ、材料のデータそして伝音体の寸法に依存して選択 されると。When this fill level indicator is used in an automobile tank, it is generally There is an operating range of 60°C to 60°C. Regarding this operating range, it is assumed that the temperature is 20℃. such that the average error is minimized for a given measurement sensitivity at the average operating S temperature. , the signal frequency f of the transmitter 13 can be determined. 1! ! The concept of constant S degree is 0 transmitter 1 which can be understood as the change in velocity of a deflection wave due to liquid loading 3 frequencies f are selected depending on the liquid data, material data and the dimensions of the sound conductor. When it happens.
充填レベル表示装置の測定感度は前記パラメータによってもはやほとんど低下せ しめられることはない、液体のデータ及び伝音体の材料のデータはそれぞれ既に 確定している。ところで、周波数ｆ。ｐｔが伝音体１１の厚さｄに近似的に反比 例することが有利にも判明している０式ｔ ｏｐｔｚ ５０ｋＨｚ ｗａｎｄを 用いて最適な信号周波数ｆ を決定することができる。前記式は特に、ｐｔ 伝音体１１の材料としてテルメラスト（Ｒ’ ４００２スはスチールが使用され る場合に成り立つ、第２図には、１０００・１０・１．５ｍ３の寸法の前記材料 についての測定感度の関係が、温度の関数として、３種類の測定周波数ｆ −２ ０ｋ）１ｚ、ｆ２−３＋ｋＨ２，ｆ３−４０ｋ）１２について表示されている、 媒体としてはガソリンが使用されている。The measurement sensitivity of the filling level indicator is no longer significantly reduced by the above parameters. The data for the liquid and the material for the sound conductor have already been updated. It's confirmed. By the way, the frequency f. pt is approximately inversely proportional to the thickness d of the sound conductor 11 For example, it has been found advantageous to use the Type 0 toptz 50kHz wand. can be used to determine the optimal signal frequency f. In particular, the above formula is pt Steel is used as the material for the sound conductor 11 for Termerast (R'4002). Figure 2 shows the above material with dimensions of 1000.10.1.5 m3 The relationship of measurement sensitivity for three types of measurement frequency f −2 as a function of temperature 0k)1z, f2-3+kH2, f3-40k)12, Gasoline is used as the medium.
ｙ軸上には、測定感度の相対的関係として、媒体の負荷によるたわみ波速度Ｃの 変化△Ｃ／△Ｃ３が与えられている。第２図から明らかなように、周波数ｔ ２ −３１ｋＨｚについては一２０℃〜６０℃の温度範囲における最大誤差は０．８ π以下であり、したがって評価回路を用いると平均誤差は±０．４ｘより小さく なる。On the y-axis, as a relative relationship of measurement sensitivity, the deflection wave velocity C due to the load on the medium is plotted. A change ΔC/ΔC3 is given. As is clear from Fig. 2, the frequency t2 For -31kHz, the maximum error in the temperature range of -20℃ to 60℃ is 0.8 π or less, so when using the evaluation circuit, the average error is less than ±0.4x. Become.
測定感度を温度補償すること及びゼロ点を温度補償することについての前記一方 法を組み合わせると、広い温度範囲において温度に影響されない充填レベル表示 装置を得ることができる。The above-mentioned one of temperature-compensating the measurement sensitivity and temperature-compensating the zero point. Combined methods provide temperature-independent filling level indication over a wide temperature range. You can get the equipment.
国際調査報告 国際調青報告international search report International blue report
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3822993.5 | 1988-07-07 | ||
| DE3822993A DE3822993A1 (en) | 1988-07-07 | 1988-07-07 | LEVEL INDICATOR |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03500333A true JPH03500333A (en) | 1991-01-24 |
Family
ID=6358148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1505392A Pending JPH03500333A (en) | 1988-07-07 | 1989-05-31 | filling level indicator |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5042298A (en) |
| EP (1) | EP0413754B1 (en) |
| JP (1) | JPH03500333A (en) |
| KR (1) | KR900702337A (en) |
| DE (2) | DE3822993A1 (en) |
| WO (1) | WO1990000725A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2013859A1 (en) * | 1990-04-04 | 1991-10-04 | Cheng-Kuei Jen | Thin rod flexural acoustic wave sensors |
| DE10139242A1 (en) * | 2001-08-09 | 2003-03-06 | Grieshaber Vega Kg | Method and device for detecting a filling process |
| US20060169055A1 (en) * | 2005-01-06 | 2006-08-03 | Sensotech | Method and system for measuring fluid level in a container |
| US8919193B2 (en) | 2011-08-30 | 2014-12-30 | Street Smart Sensors Llc | Ultrasonic liquid level detector |
| DE102012021794B3 (en) * | 2012-11-08 | 2014-01-16 | Krohne Messtechnik Gmbh | Measuring arrangement for determining a measured variable |
| EP3511685A1 (en) * | 2018-01-16 | 2019-07-17 | Ovinto cvba | Improved evaluation of filling state in cargo transport |
| US11714176B1 (en) * | 2022-09-23 | 2023-08-01 | Texzec, Inc. | Helical acoustic liquid level sensor |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2910999A (en) * | 1958-07-03 | 1959-11-03 | Jersey Prod Res Co | Gas-operated liquid level sensor |
| US3133442A (en) * | 1962-05-23 | 1964-05-19 | Rosemount Eng Co Ltd | Level sensor |
| US3229523A (en) * | 1963-09-10 | 1966-01-18 | Charles A Boyd | Apparatus employing vibratory energy |
| US3512400A (en) * | 1967-04-13 | 1970-05-19 | Panametrics | Ultrasonic testing method |
| GB1595194A (en) * | 1977-09-13 | 1981-08-12 | Marconi Co Ltd | Liquid level sensing device |
| JPS59107236A (en) * | 1982-12-13 | 1984-06-21 | Chichibu Cement Co Ltd | Viscosity measuring method |
-
1988
- 1988-07-07 DE DE3822993A patent/DE3822993A1/en not_active Withdrawn
-
1989
- 1989-05-31 JP JP1505392A patent/JPH03500333A/en active Pending
- 1989-05-31 KR KR1019900700475A patent/KR900702337A/en not_active Application Discontinuation
- 1989-05-31 EP EP89906037A patent/EP0413754B1/en not_active Expired - Lifetime
- 1989-05-31 US US07/466,274 patent/US5042298A/en not_active Expired - Fee Related
- 1989-05-31 WO PCT/DE1989/000346 patent/WO1990000725A1/en active IP Right Grant
- 1989-05-31 DE DE8989906037T patent/DE58903301D1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE3822993A1 (en) | 1990-01-11 |
| WO1990000725A1 (en) | 1990-01-25 |
| EP0413754A1 (en) | 1991-02-27 |
| KR900702337A (en) | 1990-12-06 |
| US5042298A (en) | 1991-08-27 |
| EP0413754B1 (en) | 1993-01-13 |
| DE58903301D1 (en) | 1993-02-25 |
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